Oil burner apparatus



June 15, 1965:-

T. A. DAVIDSSON OIL BURNER APPARATUS Filed Feb. 11. 1964 INVENTOR TAGEARNOLD DAVIDSSON "i -\.E I Ill BY Wm ATTORNEY 3 United States PatentOfiice 3,189,078 Patented June 15, 1965 Filed Feb. 11, 1964, Ser. No.344 ,067 1 Claim. (Cl. 158- -36.3)

The present invention relates to oil burner apparatus of the typewherein a gaseous pressure medium is utilized for driving a pumpingdevice adapted to supply fuel oil to the burner.

The invention has for its object to provide an improved oil burnerapparatus of the above kind. The main characteristic of the invention isthat said pressure medium consists of a combustible gas, means beingprovided for feeding to the burner the combustible gas which has beenutilized for the pumping.

Said pumping device may comprise a piston pump, in which case, accordingto the invention, that chamber of the pump cylinder which is connectedto the pressure gas source is also connected to the burner by means of aconduit provided with a mechanically operated valve.

One embodiment of the invention is illustrated in the accompanyingdrawing.

In the drawing, numeral 1 indicates an open top fuel oil containersecured to the top of a sheet metal casing 31 enclosing pump means whichwill be described in detail herebelow. Numeral 2 indicates a pressurecontainer containing a hydrocarbon (e.g. propane) compressed into liquidstate, and 19 is the oil burner.

The pump means within the casing 31 comprises two pump cylinders 5 and 6with pistons 7 and 8, respectively. The piston rods 32 and 33 of thepistons 7 and 8, respectively, have their free ends pivotally connectedto the opposite ends of a double-armed lever which is pivoted centrallybetween its ends on a shaft 9 secured to a vertical support 34 providedin the casing 31. By means of the lever 10 the pistons 7 and 8 areinterconnected in such a manner that when one of the pistons is movingdownwardly the other one moves upwardly. The cylinders 5 and 6 areconnected at their lower ends by means of conduits 3 and 4,respectively, each containing a slide valve 22 and 24, respectively, toa pressure gas supply pipe 35 which extends through the wall of thecasing 31 and is connected via a shut-off valve 36 to a conduit 37connected to the top of the pressure container 2. The upper ends of thecylinders 5 and 6 are connected by means of conduits 11 and 12,respectively, each contain ing a check valve 13 and 14, respectively, toa fuel supply pipe 38 connected to the bottom of the fuel oilcontainer 1. The upper ends of the cylinders 5 and 6 are furtherconnected to a fuel outlet pipe 39 by means of conduits 17 and 18,respectively, each containing a check valve and 16, respectively. Thefuel outlet pipe 39 extends through the wall of the casing 31 and isconnected by means of a shut-off valve 40 to a conduit 41 which suppliesfuel to the oil burner 19. The lower ends of the cylinders 5 and 6 arealso connected by means of conduits 2t) and 21, respectively, whichcontain slide valves 23 and 25, respectively, to a gas outlet pipe 42which extends through the wall of the casing 31 and connects via ashut-off valve 43 to a conduit 44 which is connected to the oil burner19 for supplying gas thereto.

The slide valves 22, 23, 24 and 25 provided in the conduits 3, 20, 4 and21, respectively, each have an open position and a shut-01f position,and means are provided for operating the valves in interlockedrelationship in such a manner, that when the valves 22 and 25 are in theshut-off position the valves 23 and 24 are in the open position, andvice versa. The means for simultaneously operating the four valves 22-25comprises a doublearmed lever 27 which is pivoted on a shaft 26 securedto the vertical support 34 a distance above and in the same verticalplane as the pivot shaft 9 of the lever 10. To each arm of the lever 27there is pivotally connected, by means'of a pin 49 engaging in a slot 50in the lever arm, one end of a rod 28 and 29, respectively, which hasits other end connected to the valve body of the slide valve 23 and 25,respectively. The valve bodies ofthe valves 22 and 23 are rigidlyinterconnected by means of a con necting rod 45, and a similar rod 46 isconnected between the valve bodies of valves 24 and 25. The lever 27 iscapable of swinging between the inclined position shown in the drawingand a position correspondingly inclined in the other direction, therebyswitching the valves 22-25 from one position to the other. The lever 27is disposed in the path of movement of the lever 10 in such a mannerthat during swinging of the lever 10 the arms thereof will abut the armsof lever 27 and thereby cause the swinging of the latter. To provide arapid switching of the valves 22-25 from one position to the other bymeans of the lever 27, there is provided a draw spring 127 which has oneend connected to a projection 47 on the upper side of the lever 27 andwhich has its other end connected to the vertical support 34 at 48 belowthe pivot shaft 9 for the lever it). It will be seen that the swingingof the lever 27 from one inclined end position towards the opposite endposition will first be resisted by the spring until a dead centerposition is reached after which the spring will rapidly pull the leverover to the other end posit-ion, thereby reversing the valves 22-2-5.

The pump mechanism described above operates in the following manner:

In the position shown in the drawing the valves 23 and 24 are in theopen position and the valves 22 and 25 are in the closed position. Thegas from the container 2 will then be supplied via the open valve 24 tothe cylinder 6 and will push the piston 8 upwardly and consequentlycause the piston 7 to be displaced downwardly, so that the fuel oil inthe cylinder 6 will be fed to the burner 19 while at the same time fueloil will be sucked into the upper portion of the cylinder 5 andcombustible gas which is present in the cylinder chamber below thepiston 7 and which has already been utilized for the pumping will be fedto the burner via the open valve 23. During the continuedupwardrnovement of the piston 8 from the position shown in the drawing,the lever 10 will swing the lever 27 past the dead center point so thatthe spring 127 will rapidly move the lever 27 to the other end positionthereby causing the valves 22 and 25 to open and the valves 23 and 24 toclose, whereat the piston 7 will be pushed upwardly by gas from thepressure container supplied to cylinder 5 via the open valve22. The fueloil previously sucked into the cylinder 5 will then be fed to theburner, and at the same time fuel oil will be sucked into the cylinder 6and the combustible gas present therein will be fed to the burner viathe valve 25, whereafter the described cycle will be repeated.

In the embodiment shown in the drawing the two sides of each piston havesubstantially equal areas, although the piston rod slightly reduces theeffective area on one side.

It is to be understood that the embodiment hereinbefore described andshown in the drawing is for explanatory purposes only and is not to betaken as limitative with respect to the details of the invention whichmay be varied within the scope of the appended claim.

What I claim is:

An oil burner utilizing a fuel oil and a combustible gas comprising apiston pump including a pump cylinder and piston slideable therein, asource of a combustible gaseous pressure medium, a first conduitconnected to i) said source of combustible gaseous pressure medium andto said cylinder on one side of said piston, a source of fuel oilconnected to said cylinder on an opposite side of said piston, an oilburner, a second conduit connected to the same side of said cylinder assaid source of fuel oil and also to said oil burner for supplying fueloil thereto, a third conduit connected to said cylinder on the same sidethereof as said source of combustible gaseous pressure medium and alsoto said oil burner for supplying said combustible gaseous pressuremedium thereto, mechanically operated valve means for alternatelyopening and closing said first and third conduits whereby said piston israised and lowered and one way valve means each interposed in saidsecond conduit and the connection of said source of fuel oil to saidcylinder.

References Cited by the Examiner UNITED STATES PATENTS JAMES W.WESTHAVER, Primary Examiner.

ROBERT A. DUA, Examiner.

